Geopolitically to say Taiwan is China's Jerusalem. And Taiwan is a reward for China sacrificed milions of lives in the world war 2. Chinese already shed blood for Taiwan. It can not be taken by others easily.Honestly speaking.
Do you truly want that "unification"? Even though that would certainly mean a war with potentially hundreds of thousands of dead, or far more if it becomes a world war?
This situation is not like us with the Palestinians, there are no real battles, no one died, no bad blood. China seems to be succeeding without Taiwan so there's no need for it, why risk such a war?